CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) shares in Millions, $ in Millions	May 31, 2016	May 31, 2015
Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 327	$ 285
Preferred stock par value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	1	1
Preferred stock shares outstanding	0	0
Common stock par value per share	$ 0.01	$ 0.01
Common stock shares authorized	11,000	11,000
Common stock shares outstanding	4,131	4,343